A

Agricultural Research Service Software - Offers certain free, downloadable software and models for use in predicting and analyzing topics such as erosion, pest migration, crop growth, watersheds, and more. [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

W

Water Erosion Prediction Project - This is a process-based, distributed parameter, continuous simulation, erosion prediction model for use on personal computers running Windows. [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS), National Soil Erosion Research Lab]